What to do?

I am only a couple of weeks into my fund raising but it has become clear that there are people out there who have decided they won't sponsor me as they don't actually want me to shave my head. That leaves me in a bit of a quandary. Do I let down the few who have generously donated already and not shave my head? Do I come up with another idea? Do I do it despite not reaching my target? 
It has left me feeling a bit useless. What with Mike's dialysis five times a week,  looking after the essential household tasks and trying to run a small business I don't have the time to spend training for an athletic task. So dear readers I really need your help with coming up with a plan.